Set different page title for every other page

Hey mwhitney,
thx for your help
i have solution like this

PHP Code:

class Pages extends CI_Controller {
    function index() {
        $data['title'] = "Startseite";
        $this->load->view('templates/header', $data);
        $this->load->view('pages/startseite', $data);
        $this->load->view('templates/footer', $data);
        }
    function about_us() {
        $data['title'] = "About us";
        $this->load->view('templates/header', $data);
        $this->load->view('pages/about-us', $data);
        $this->load->view('templates/footer', $data);
        }
} 


some change in routers. and work good, but the url address is "about_us" can you help me how to make the url address "about-us", when i put

PHP Code:

function about-us() { 


i got php error, can you help me please how to make the url address "about-us", with "-" and not "_" (underscore)

Thx again
Regard
Wiyono